| Z03.81 | Encounter for observation for suspected exposure to biological agents ruled out | NON-BILLABLE CODE |
| Z03.810 | Encounter for observation for suspected exposure to anthrax ruled out | BILLABLE CODE |
| Z03.818 | Encounter for observation for suspected exposure to other biological agents ruled out | BILLABLE CODE |
| Z03.82 | Encounter for observation for suspected foreign body ruled out | NON-BILLABLE CODE |
| Z03.821 | Encounter for observation for suspected ingested foreign body ruled out | BILLABLE CODE |
| Z03.822 | Encounter for observation for suspected aspirated (inhaled) foreign body ruled out | BILLABLE CODE |
| Z03.823 | Encounter for observation for suspected inserted (injected) foreign body ruled out | BILLABLE CODE |
| Z03.83 | Encounter for observation for suspected conditions related to home physiologic monitoring device ruled out | BILLABLE CODE |
| Z03.89 | Encounter for observation for other suspected diseases and conditions ruled out | BILLABLE CODE |
